United States Government Publishing OfficepublisherpbldistributordstUnited StatesNational Archives and Records AdministrationOffice of the Federal RegisterauthorautGovernment Organizationtextgovernment publicationengFRRegulatory Information2006_registerexecutive2010-09-22articleAirworthiness Directives; Pratt & Whitney JT9D-7R4G2 Turbofan EnginesProposed RulesD09002ee18eb42631D09002ee18eb426caUnited StatesDepartment of TransportationoriginatororgUnited States Government Agency or SubagencyUnited StatesFederal Aviation AdministrationoriginatororgUnited States Government Agency or SubagencyThe FAA proposes to adopt a new airworthiness directive (AD) for Pratt & Whitney (PW) JT9D-7R4G2 turbofan engines. This proposed AD would require replacing the old configuration 2nd stage high pressure turbine (HPT) air seal assembly with a new design 2nd stage HPT air seal assembly that increases cooling air flow. This proposed AD results from a report of an uncontained failure of the 2nd stage air seal assembly, caused by the air seal assembly brace disengaging from the air seal, due to insufficient cooling air flow. We are proposing this AD to prevent uncontained failure of the 2nd stage HPT air seal assembly, leading to engine in-flight shutdown and damage to the airplane.71 FR 24613https://www.gpo.gov/fdsys/granule/FR-2006-04-26/06-392206-3922fr26ap06-23RIN 2120-AA644910-13-PDocket No. FAA-2006-23742https://www.gpo.gov/fdsys/granule/FR-2006-04-26/06-3922/content-detail.htmlhttps://www.gpo.gov/fdsys/pkg/FR-2006-04-26/html/06-3922.htmhttps://www.gpo.gov/fdsys/pkg/FR-2006-04-26/pdf/06-3922.pdfAir TransportationAircraftAviation SafetySafety3 p.246132461571 FR 24613Code of Federal RegulationsTitle 14 Part 3914 CFR Part 39RIN 2120-AA64Airworthiness Directives; Pratt & Whitney JT9D-7R4G2 Turbofan Engines; Federal Register Vol. 71, Issue PRORULE06-3922DEPARTMENT OF TRANSPORTATIONFederal Aviation Administration2006-06-26Docket No. FAA-2006-23742Directorate Identifier 2005-NE-53-AD4910-13-P06-3922Notice of proposed rulemaking (NPRM).The FAA proposes to adopt a new airworthiness directive (AD) for Pratt & Whitney (PW) JT9D-7R4G2 turbofan engines. This proposed AD would require replacing the old configuration 2nd stage high pressure turbine (HPT) air seal assembly with a new design 2nd stage HPT air seal assembly that increases cooling air flow. This proposed AD results from a report of an uncontained failure of the 2nd stage air seal assembly, caused by the air seal assembly brace disengaging from the air seal, due to insufficient cooling air flow. We are proposing this AD to prevent uncontained failure of the 2nd stage HPT air seal assembly, leading to engine in-flight shutdown and damage to the airplane.We must receive any comments on this proposed AD by June 26, 2006.Kevin Donovan, Aerospace Engineer, Engine Certification Office, FAA, Engine and Propeller Directorate, 12 New England Executive Park, Burlington, MA 01803; telephone (781) 238- 7743, fax (781) 238-7199.Air TransportationAircraftAviation SafetySafetyAirworthiness directives:Pratt Whitney, http://dms.dot.govhttp://www.regulations.govFederal RegisterVol. 71, no. 80Office of the Federal Register, National Archives and Records Administration2006-04-26continuingdailydepositedborn digital262 p.
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AE 2.7:GS 4.107:AE 2.106:KF70.A2https://www.gpo.gov/fdsys/pkg/FR-2006-04-26P0b002ee18096001e0097-63260042-12190364-1406769-004-00000-9000582072f:fr26ap06https://www.gpo.gov/fdsys/pkg/FR-2006-04-26/content-detail.htmlhttps://www.gpo.gov/fdsys/pkg/FR-2006-04-26/pdf/FR-2006-04-26.pdfhttps://www.gpo.gov/fdsys/pkg/FR-2006-04-26/xml/FR-2006-04-26.xmlfdlp2455124801DGPO2010-09-222016-02-22FR-2006-04-26machine generatedengFRFR-2006-04-267180